You've got an earlier version of the infamous yellow relay, with the brown wire coming out the side, so the terminals you jump across may be different that what we've directed. No problem, as you've apparently done your own homework on the work-around as to which to short across. Have you confirmed that your pumps run with the jumper in place and the relay completely removed?
As to the overboost pressure switch, here's a diagram that may help point you to it's location (open the link and click on the diagram)Pelican Parts - Product Information: 930-606-101-00-M100

__________________Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.